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2018 Q50 Red Sport - Reduced Power and Check Engine Light, Turbo Issues?

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Kevin B. · rep 0 · May 22, 5:09 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 Red Sport 400

Hey everyone,

I'm reaching out because I've been experiencing some concerning issues with my 2018 Infiniti Q50 Red Sport 400. Lately, I've noticed a significant reduction in power, especially during acceleration, and the car just doesn't feel as responsive as it used to. To top it off, the Check Engine Light (CEL) has come on.

I haven't had a chance to get the codes read yet, but I'm worried it might be something serious with the turbos. I've heard some chatter online about potential turbo-related problems with the VR30DDTT engine in these models. Has anyone else with a 2018 Q50 Red Sport experienced similar symptoms?

What are the common causes for reduced power and a CEL in this specific model? Is this a known reliability issue, and what should I be looking out for? Any advice on initial diagnostics or what to tell my mechanic would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:09 AM

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ClearTheCode admin answer:

It sounds like you're experiencing a common set of symptoms that can point to several issues, often related to the VR30DDTT engine's forced induction system. Here's a breakdown of potential causes and steps:

  1. Get the OBD-II Codes Read Immediately: This is the most crucial first step. Common codes associated with reduced power and turbo issues include:

    • P0234: Engine Overboost Condition
    • P0299: Engine Underboost Condition
    • P0101: Mass Air Flow (MAF) Sensor Performance Problem
    • P0456 or P0442: Evaporative Emission System Leak (less likely to cause power loss but can trigger CEL)

  2. Common Causes for Reduced Power/CEL in VR30DDTT:

    • Turbocharger Speed Sensor Failure: This is a known issue on some VR30DDTT engines. A faulty sensor can cause the ECU to limit boost, leading to reduced power. Infiniti has released TSBs (Technical Service Bulletins) related to this, so it's worth checking if your VIN is covered.
    • Wastegate Actuator Issues: Problems with the electronic wastegate actuators can prevent proper boost control, resulting in either overboost or underboost conditions.
    • Boost Leaks: Hoses, intercooler piping, or clamps can develop leaks, allowing boost pressure to escape and reducing engine power.
    • MAF Sensor Malfunction: A dirty or failing MAF sensor can send incorrect air intake readings to the ECU, leading to improper fuel-air mixture and reduced performance.
    • Spark Plugs/Ignition Coils: While less common for sudden, severe power loss, failing ignition components can cause misfires and reduced power.

  3. When to See a Shop:

    • Immediately: If the CEL is flashing, this indicates a severe misfire that could damage the catalytic converter. Stop driving and have it towed.
    • As Soon As Possible: If the CEL is solid and you're experiencing significant power loss, it's best to have a qualified Infiniti technician diagnose the issue. Driving with reduced power can sometimes exacerbate underlying problems or cause secondary damage.
    • Specialized Tools: Diagnosing turbo-related issues often requires specialized diagnostic tools to monitor boost pressure, wastegate duty cycles, and sensor readings in real-time. A general mechanic might not have the specific knowledge or equipment for the VR30DDTT engine.
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